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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa091ce80b17031c4dde4e907e43d6a2335ae67c73bdc1bf36d456e958311f4a' 
  AND token = 'Poy35FXkbmScHH7Kr5QJALJBEAUyX9AlBlzP1jqiijA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}